I would appreciate a bit of guidance on my project. 3 years ago I had repairs done to the passenger side door of my gold 2002 Ford Taurus. A few months ago I noticed that their was a haze in the upper panels. The rest of the cars paint is fine. The clear coat came off like a powder with a little bit of hand buffing. Then It clicked, the place which did the repair repainted the two door panels and front fender.

It looks terrible. I would like to reclearcoat these panels. I have Nason SelectColor 4600-00 Clear and 483-84.

This is not to achieve a factory level, just to make it look acceptable.

Please advise any steps.

(They also recleared just under the Drivers Headlamp. The loss of clear is about the size of my hand. So I will use that as my test area).

Should I chemically clean the area first or after I sand?

I have read to use 400 and also 800 sand paper? What is best? Wet or dry?

IMO that is going to be a tough one. You must remove enough of the old clear without removing or damaging the underlying color coat. Any chemical cleaner that is strong enough to remove the clear is also going to remove or damage the base color. Since the old clear appears to be lifting it is doubtful that you could use it as a base to apply another coat of clear and obtain acceptable results. A complete panel repaint may your only option.

That looks like a blend line.
(where new clear stoped on exist clear.)
That is a good example why the entire panel should be cleared.
To save costs, some shops blend instead of clearing the entire panel.
Even if it's not a blend, either way,
you need to remove as much as possible, and you'll have to
re-base for sure. Always clear the entire panel when possible.

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